计及寄生参数效应的铁氧体共模扼流圈二端口网络的建立

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Abstract Because of the effects of parasitic couplings of choke playing important roles in the high frequency performance of EMI filters, it is necessary to construct the 2-port network models corresponding to the CM and DM circuits for designing EMI filters and improving their performance. For the equivalent DM circuit, while the partial capacitances of turn to turn was calculated by setting up the electrostatic mode, the equivalent parasitic capacitance can be obtained. Further, capacitive parameters in each branches of 2-port for CM are obtained. The DM leakage inductance can be achieved if the resonant frequency is measured. For the equivalent CM circuit, equivalent magnetic core resistance and inductance can be solved using analogical finite element method (FEM) by setting up the mode of harmonic magnetic field. The parasitic capacitance considering the environmental factor can be achieved if the resonant frequency is measured. To measure the scattering parameters under the input and output matching state for choke, the branch impedance or admittance of DM and CM models are achieved indirectly. The impedance of branches using scattering parameters measurement are in good agreement with the ones using ‘resonant frequency adding FEM'. It is demonstrated that the veracity of setting modes and the rationality of measuring method.

Key words： Choke differential mode circuit common mode circuit finite element method (FEM) scattering parameters resonant frequency

Received: 21 December 2008 Published: 04 March 2014

PACS:	TM135
	TM153

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	Wang Shishan
	Xie Shaojun
	Jin Yan

Cite this article:

Wang Shishan,Xie Shaojun,Jin Yan. Building of 2-Port Network for Ferrite Core Choke Considering the Effects of Parasitic Parameters[J]. Transactions of China Electrotechnical Society, 2010, 25(5): 1-8.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2010/V25/I5/1

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作者简介：王世山男, 1967年生, 博士, 副教授, 研究方向为电磁场数值计算、电力电子电磁兼容。谢少军男, 1968年生, 教授, 博士生导师, 研究方向为功率变换器、电力电子在电力系统中应用。